AST A250 FO-PL User manual

AST A250/A450 FO-PL BT
AST - Accurate Sensing Technologies
188A, B-169 (Part), B-188 & B-189 (A)
Road No.-5, M.I.A., Madri, Udaipur (Rajasthan.) INDIA 313 003
Phone : [phone]
E-mail: [e-mail]
USER MANUAL
Accurate Sensing Technologies
Non-contact Infrared Pyrometers
We measure accurate temperature in extreme conditions
5.2 Communication
After installation, switch on Bluetooth of mobile. Scan for available devices. (Fig. 6)
Select the device name from list for pairing. (Fig. 5.7)
For pairing user need to enter pin no. Pin no will be reverse of last four digit of device name.( For eg:- if device name is
A2B-1627 then pin will be 7261). (Fig. 5.8)
5.

Accurate Sensing Technologies
Index
1. Chapter - 1
General information
2. Chapter - 2............................................................................................................................. 2
Introduction
2.1 Product Key Features, Application and Range
2.2 Technical specification
2.3 Fiber optic cable
2.4 Optics
3. Chapter - 3............................................................................................................................. 5
Basics & Installation of Pyrometer
3.1 Basics of Infrared temperature measurement of an object
3.2 Installation
3.3 Location Selection
3.4 Mechanical Accessories
3.5 Electrical Installation
4. Chapter - 4............................................................................................................................. 13
Software installation
4.1 Installation
4.2 Parameters in main screen
5. Chapter - 5............................................................................................................................. 20
Android Application Software
5.1 Installation Process
5.2 Communication
5.3 Operation
5.4 Data logging & Online graph
6. Chapter - 6............................................................................................................................. 24
Calculate Spot size
7. Chapter - 7............................................................................................................................. 25
Maintenance
8. Chapter - 8............................................................................................................................. 26
Serial communication protocol
9. Appendix B............................................................................................................................ 31
10. Appendix C............................................................................................................................ 32
............................................................................................................................. 1
5.2 Communication
After installation, switch on Bluetooth of mobile. Scan for available devices. (Fig. 6)
Select the device name from list for pairing. (Fig. 5.7)
For pairing user need to enter pin no. Pin no will be reverse of last four digit of device name.( For eg:- if device name is
A2B-1627 then pin will be 7261). (Fig. 5.8)
5.

Accurate Sensing Technologies
1
Congratulations on choosing this high quality and highly efficient AST pyrometer for non contact temperature
measurement.
Please read this user manual carefully, step by step, including all notes of security, operation and maintenance
before installing the pyrometer. This manual contains all the necessary instructions for set up and operation of the
pyrometer. This section provides an overview about important safety regulations.
Some Important Safety Regulations Given Below
1. Safety Precaution
Each person working with pyrometer must read the user manual before operation. The pyrometer has only to be
used for the purpose described in manual. The pyrometer works only with a potential free low voltage of range
24VDC. This voltage is not harmful for user. The pyrometer may contain harmful material and hence it should not be
disposed of with normal waste.
2. Packaging and Storage
Always use a shock proof package for shipment of pyrometer. It should be sealed to protect it against humidity. Also
protect the lens of pyrometer with cover. They should be stored at the temperature range from -20°c to 70°c.
3. Limit of Liability and Warranty
All general information and notes for handling, maintenance and cleaning of this instrument are offered according to
the best of our knowledge and experience.
AST reserves the right to revise this document and to make change from time to time in the content hereof without
obligation to notify any person or persons for such revisions or changes.
AST instruments have a warranty of two year from the invoice date. This warranty covers manufacturing defects and
faults which arise during operation only if they are the results of defects caused by AST.
AST does not accept liability for any damages or losses which might occur, including consequential damages and
financial losses, as a result of use of the instrument.
4. Copyright
All rights reserved this document may contain proprietary information and shall be respected as a proprietary
document to AST with permission for review and usage given only to the rightful owner of the instrument with which
this document is associated.
Chapter - 1
General Information
5.2 Communication
After installation, switch on Bluetooth of mobile. Scan for available devices. (Fig. 6)
Select the device name from list for pairing. (Fig. 5.7)
For pairing user need to enter pin no. Pin no will be reverse of last four digit of device name.( For eg:- if device name is
A2B-1627 then pin will be 7261). (Fig. 5.8)
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Accurate Sensing Technologies
2
Chapter - 2
Introduction
AST A250/A450 FO-PL BT is specially designed highly accurate digital single color pyrometer with fiber optic to
provide high performance and low maintenance of non contact temperature measurement in demanding industrial
environment. They are designed for areas with high ambient temperature (upto 250°C) without cooling or in areas
where strong electromagnetic interference can influence correct measurement because the fiber & optical head do
not contain any electronic part.
2.1 Product key features Working Principle, Range & Application
AST A250/A450 FO-PL BT are highly accurate pyrometers with fiber optics especially designed for rough industrial
environment for temperature measurement of metals, ceramic or graphite. They are suitable for high temperature
measurement ranging from 250°C to 2500°C.
These pyrometers have solid body in stainless steel housing which provides high operation safety even in rough
industrial environment, and large variety of optics with fixed focus which can be easily used in all industrial areas. The
radiation from hot object is focused on the detector by optics which then travel into mono fiber cable with flexible
stainless steel protection tube and converted into electrical signals. This signal is then linearize and converted into
standard analog & digital outputs.
AST A250/A450 FO-PL BT has a fast response time of 2msec. Pyrometer have RS-232, RS-485 outputs. Response time,
emissivity, sub range and peak picker selection can be preset ex works or adjusted through available software.
According to application there are two optical heads small (head 1), big (head 2 & variable head).The heat radiation,
enter from optical head, to the lens system & travel through mono glass fiber with flexible stainless steel protection
tube where it is transmitted along optical fibre with the help of optical head. The optical head contains only the lens
system, the electronic are located in the converter box, so the measurement is possible in atmospheric condition up
to 250°C.
The pyrometer temperature measurement method utilizes the fact that objects emit thermal radiation in an amount
that directly corresponds to their own temperature and surface emissivity.
Single Colour Mode : Single colour mode is best for measuring the temperature of target object in areas where no
sighting obstacle is present between the target object and the pyrometer. Sighting obstacle can be any solid item,
gaseous particles, smoke and dust etc. This mode is very useful where target object completely fills the spot size.
The applications in which AST pyrometers can be used are:
üInduction heating
üAnnealing
üWelding
üForging
üSintering
üRolling mills
üRotary kilns
Standard Item supplied with AST A250/A450 FO-PL BT:
üAST pyrometer
üConnection cable 12-core (length - 5 m)
üDigital cable 3-core (length - 1.5 m)
üMono fiber optic cable (length - 2.5 m)
üOptical head
üAST software CD
üManual
üCertificate of calibration
5.2 Communication
After installation, switch on Bluetooth of mobile. Scan for available devices. (Fig. 6)
Select the device name from list for pairing. (Fig. 5.7)
For pairing user need to enter pin no. Pin no will be reverse of last four digit of device name.( For eg:- if device name is
A2B-1627 then pin will be 7261). (Fig. 5.8)
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Accurate Sensing Technologies
3
2.2 Technical Specifications
Fig. 1 Dimensions of Pyrometer
Dimensions
Model AST A250 FO-PL BT
Measured Temperatures Range
(Analog sub range adjustable)
250°C - 1800°C
300°C - 2500°C
Emissivity Range 0.1…..1.0 adjustable
Spectral Range, µm 1.0µm1.6µm
Photodetector Type InGaAs
Response Time 2msec. Adjustable upto 10Sec.
Accuracy
Repeatability
+/- 0.3% of the measured value + 1°C
+/- 0.1% of the measured value + 1°C
Analog Output 4 - 20mA or 0 - 20mA or 0 -10 V user selectable
Digital Output Bluetooth V2.0, RS-232 or RS-485 (User Selectable)
Power Supply 12 C - 28 V DC with reverse voltage protection
Operating temp. range at fiber Max.250°C at fiber optics cable and optical head, 0….70°C at pyrometer
Fiber Optic 2.5meter standard (available 5, 10, 15, 20 meter on request)
Sighting Laser coliminated
Isolation Power supply and digital output and analog output are galvanically isolated against
each other
Operating humidity 10 - 95%, Non-Condensing Conditions
Housing Stainless steel, IP65
Ø49.5 mm; L=118mm;/0.6kg
600°C - 2500°C
Si
Power Consumption Max. 2.5 Watt.
100:1 OH(l)
200:1 OH(II)
200:1 OH(ll)
200:1 OH(ll) Variable
100:1 OH(I)
200:1 OH(II)
200:1 OH(ll) - Variable
Distance to Spot Size Ratio
118 mm
Ø48 mm
Ø49.5 mm
34.5 mm
Ø15 mm
6.5 mm
22.5 mm
Binder
Connector
OH-I OH-II
OH-Il (Variable Head)
44 mm
Ø14.5 mm
M16 x 1.0
74.5 mm
Ø25 mm
25 mm
M25 x 1.5
66.4 mm
Ø25mm
M25x1.5
2.3 Fiber optics cable
The fibre optic cable has a small radius it can be “snaked” around and through machinery, walls and other obstacles.
Cable can be changed if needed. Fibre optic cable with us can be supplied on request its details are given as in the
description under. Longer fibre optic cable allows the pyrometer to be used away from the hostile environment.
The radiation, from object coming through optical head, is transported by the lens into the
mono fiber cable with flexible stainless steel protection where it is transmitted to the
converter. It can withstand ambient temperature upto 250°C without cooling because there is
no electronic part.
Length : 2.5m scop of delivery; 5m, 7.5m, 10m, 15m, 30m on request
Ambient temp. : Max 250°C (Reference no: 5000-01)
Fig. 2 Replacement fiber
optic cable 2.5 M
AST A450 FO-PL BT
5.2 Communication
After installation, switch on Bluetooth of mobile. Scan for available devices. (Fig. 6)
Select the device name from list for pairing. (Fig. 5.7)
For pairing user need to enter pin no. Pin no will be reverse of last four digit of device name.( For eg:- if device name is
A2B-1627 then pin will be 7261). (Fig. 5.8)
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Accurate Sensing Technologies
4
2.4 Optics
Pyrometer receives heat radiation from the measured
object, which is converted to an electrical signal after
passing through the lens. The measured object can be at
any distance from pyrometer however as far as the object
from pyrometer the measured area (Spot size) will be
larger.
Depending on the application the instrument will be
delivered with a small or big optical head:
Type I - “Optical head-I” is suitable for use in confined
spaces due to very small dimensions. The optics is
adjusted to one of the measuring distances mentioned in
following table.
Type II - This optical head is fixed adjusted optical head
and is bigger in size than “optical head-I”
Type lll - VariableWith variable optical head ll [OH ll - V]
each working distance can be adjusted according to the
pull out length as mentioned in the spot size table.
Variable Optics
Working Distance (mm)
Optical Head Length L (mm)
Optical Pullout P(mm)
Spot Size(mm)
AST A250 FO PL
Spot Size(mm)
AST A450 FO PL
250°C - 1800°C
300°C - 2500°C
600 - 2500°C
Optical Head - ll - V (Variable)
0
66.4
0
18
11
10
250
78.9
12.5
1.3
1.3
1.3
300
75.75
9.35
1.5
1.5
1.5
400
72.8
6.4
2
2
2
600
70.1
3.7
3
3
3
800
68.8
2.4
4
4
4
1000
68.1
1.7
5
5
5
1500
67.15
0.75
7.5
7.5
7.5
2000
66.7
0.3
10
10
10
2500
66.4
0
13
13
13
Optical Head
120
260
700
Spot Sizes(mm)
250°C - 1800°C
300°C - 2500°C
Working
Distances
(mm)
A250 FO-PL BT
1.2
2.6
7.0
Fixed Optics
Optical Head - I
Optical Head - II
1.2
2.6
7.0
90
200
600
4500
0.5
1.0
3.0
23
0.5
1.0
3.0
23
A450 FO-PL BT
Spot
Sizes(mm)
600°C - 2500°C
4.0
Aperture
(mm)
10.0 (250°C - 1800°C)
6.0 (300°C - 2500°C)
18.0
Aperture
(mm)
18.0 (250°C - 1800°C)
11.0 (300°C - 2500°C)
If the pyrometer is not installed at manufactured working
distance (WD) than the spot size at actual installed
distance can be calculated. User can easily find out the
spot size For example, if factory made working distance is
260mm & pyrometer is AST 250 FO-PL then spot size is
6.5mm for head-I (as given in above table). If user
installed this pyrometer at 700mm then spot size is not
17.5mm (as given in table), user should have to calculate
as given below method.
Example of OH(ll) - V
SS 5.0 mm
WD 1000 mm
Fig. 3
Focusable Head
Pull Out (P) = 1.7 mm
Optical Head Length (L) = 68.1 mm
As per table,
when WD = 1000mm,
(Variable optics optical head ll)
Case-I: If installed working distance is greater than
manufactured working distance
Case-II: If installed working distance is smaller than
manufactured working distance
Where : S= manufactured spot size of pyrometer(mm),
A = It shows the value oflens opening (aperture in mm) Fig 4 Spot Size
5.2 Communication
After installation, switch on Bluetooth of mobile. Scan for available devices. (Fig. 6)
Select the device name from list for pairing. (Fig. 5.7)
For pairing user need to enter pin no. Pin no will be reverse of last four digit of device name.( For eg:- if device name is
A2B-1627 then pin will be 7261). (Fig. 5.8)
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Accurate Sensing Technologies
5
Chapter - 3
Basics & Installation of the Pyrometer
3.1 Infrared temperature measurement of an object
Each and every object emit definite amount of infrared radiation and its intensity varies according to the
temperature of object. Wavelength of infrared radiation lies approximately between 0.7 to 1000 µm depending on
the material and properties of object. Infrared radiations are sometimes also referred to as “heat radiations”
depends mostly on the material. This material dependent constant value is known as “emissivity”, have a look at
appendix B for emissivity values.
3.1.1 Emissivity (Ɛ)
Emissivity is the ratio of energy radiated from an object to the exterior and energy radiated from blackbody. The
emissivity varies with the surface condition of the object and also with temperature variation and wavelength. If this
value is not accurate, then the true temperature cannot be measured. In other words a variation or change in
emissivity will cause a change in the measurement.
If the value of emissivity low, your measured results may contain some errors due to interfering infrared radiations
form objects which are behind the target object like heating systems, fireclay brisk etc. Usually such type of problems
occurs while measuring very thin materials like glass, plastic etc or some reflecting surface.
This error can be reduced if the sensor is shielded from reflecting radiation sources and also by properly, carefully
installing the device.
By the application of Kirchhoff's law of thermal radiation “at thermal equilibrium, the emissivity of the body is equal
to its absorptivity (α)”. So for perfect black body, Ɛ is 1 while any real object would have Ɛ less than 1. Also the
transmissivity (т) and reflectivity (ρ) is zero. The sum of absorptivity, reflectivity and transmissivity is always 1.
α + ρ + т = 1
By emissivity factor materials can be categorized as
üMetals
üNon metals
üTransparent materials
3.1.2 Calculation of emissivity of target object
There are various methods to do so but one of most prominently used is Calculate the actual temperature of target
object using a RTD, Thermocouple etc. Measure the object's temperature; and adjust emissivity settings unless
correct temperature value is reached. Hence correct emissivity is measured of the target object.
3.2 Installation
3.2.1 Mechanical installation of pyrometer
After all preparations are completed you can install pyrometer. Installation of pyrometer depends on the type of
bracket you are using and the type of surface.
Basics of
5.2 Communication
After installation, switch on Bluetooth of mobile. Scan for available devices. (Fig. 6)
Select the device name from list for pairing. (Fig. 5.7)
For pairing user need to enter pin no. Pin no will be reverse of last four digit of device name.( For eg:- if device name is
A2B-1627 then pin will be 7261). (Fig. 5.8)
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3.2.3 Viewing Angles
The pyrometer can be placed at any angle from the target object up to 30°.indicated in the below diagram.
Fig.5 Proper mounting of pyrometer
Fig. 6 Pyrometer Acceptable Viewing angles
Background
Best critical
Incorrect
Pyrometer
Target greater than
spot size Target equal to
spot size
Target smaller
than spot size
Acceptable
Angles
Pyrometer
Best
90°C to target
Good
30°C to 90°C target
Bad
0°C to 30°C target
3.2.2 Distance of pyrometer from object
The desired spot size on the target will determine the maximum measurement distance and the focal length of the
optical module. To avoid wrong readings the spot size of target must contain entire field view of the pyrometer. The
pyrometer must be mounted so the entire field of view is the same or smaller than the desired target size. This is
indicated in the below diagram.
5.2 Communication
After installation, switch on Bluetooth of mobile. Scan for available devices. (Fig. 6)
Select the device name from list for pairing. (Fig. 5.7)
For pairing user need to enter pin no. Pin no will be reverse of last four digit of device name.( For eg:- if device name is
A2B-1627 then pin will be 7261). (Fig. 5.8)
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Accurate Sensing Technologies
7
3.3 Location selection
Qualified operating person should do the installation. Location should be good enough so that pyrometer should get
continuous infrared radiation.
Pyrometer distance from object is according to below points:-
1. Pyrometer spot size should be small than object size.
2. Know your pyrometer spot size according to point 2.3.
3. Pyrometer ambient temperature should be within 0° to 70°C (read 3.1.4).
3.3.1 Correct Positioning of the pyrometer
With pilot light (PL)
A laser targeting light will help to correct the position of the pyrometer. It is recommended that laser should be
switched off while measurement. It will increase the life of laser. To avoid measuring errors caused by a too big spot
size the pyrometer must be fixed in the correct measuring distance, so that the object under measurement fills the
spot size.
Note: The laser spot (PL) is only for indication of measuring spot, not exactly shows the measuring area.
Due to fiber optic cable the pyrometer can be placed remote from high temperature area. The optical head containing
sensor is placed at the object whose temperature is to be measured. The radiation from hot object is focused on the
detector by optics which then travel into mono fiber cable with flexible stainless steel protection tube and converted
into electrical signals. This signal is then linearized and converted into standard analog & digital outputs.
3.3.2 Mounting of pyrometer
To install the sensor head at the place of measurement a mounting support is supplied as an accessory, after losing the
clamp screws, it can be fastened correctly.
3.3.3 Ambient temperature
The allowed operation temperature for the pyrometer is 0°C to +70°C. But the temperature at fiber optic & optical
head is 250°C max. Therefore, if sensor head is to be used above 250°C water cooling jacket with built in air purge unit
is used otherwise it may damage the pyrometer. The ambient temperature is dependent on the temperature and
flow rate of cooling water. Details of air purge & water cooling jacket is given in point 3.2.
3.3.4 Atmospheric conditions
The pyrometer cannot receive the full infrared energy for the measurement if atmospheric conditions like smoke,
dust or steam are present and hence it result in measuring error. An air purge unit can be helpful to avoid
contamination such as dust and humidity on the lens. The air supplied should be at normal temperature with oil &
moisture free. The air purge generates an air stream shaped like a cone and blows particles from the lens area.
5.2 Communication
After installation, switch on Bluetooth of mobile. Scan for available devices. (Fig. 6)
Select the device name from list for pairing. (Fig. 5.7)
For pairing user need to enter pin no. Pin no will be reverse of last four digit of device name.( For eg:- if device name is
A2B-1627 then pin will be 7261). (Fig. 5.8)
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Accurate Sensing Technologies
8
Fig. 8 Air Purge Unit-Optical Head-II
(Reference No: 8200-01)
3.4 Mechanical accessories
3.4.1 Air Purge
This accessory is used to keep dust, moisture, airborne particle and vapours away from the lens head so that correct
sighting of target object can be done. (for mechanical drawing refer Appendix C.)
3.4.2 Adjustable mounting stand
This adjustable mounting stand will provide appropriate movement to the pyrometer. (for mechanical drawing refer
Appendix C.)
Fig. 7 Air Purge Unit for Optical Head-I
(Reference No: 8200-02)
Fig. 9 Adjustable Mounting for Optical Head-I
(Reference No: 8200-04)
Fig. 10
(Reference no: 8200-03)
Adjustable Mounting for Optical Head-II
5.2 Communication
After installation, switch on Bluetooth of mobile. Scan for available devices. (Fig. 6)
Select the device name from list for pairing. (Fig. 5.7)
For pairing user need to enter pin no. Pin no will be reverse of last four digit of device name.( For eg:- if device name is
A2B-1627 then pin will be 7261). (Fig. 5.8)
5.